Abstract
As a mainstream metal additive manufacturing technique, laser metal deposition (LMD) opens up new possibilities for the repair of damaged metal parts. The repair process is composed of different steps, such as three-dimensional scanning, defect detection, pre-repair machining, material addition, post-repair finishing machining, and material testing. In this work, the steps of pre-repair machining and material addition of stainless steel (SS) 316L powder on SS316L substrate using LMD were studied. Three types of grooves with different opening angles (105°, 120°, and 135°) were machined. Both the substrate and the repaired parts were characterized to investigate the influence of the opening angles on the relative density, microstructure, and mechanical properties. As compared to the substrate, the repaired parts feature heterogeneous microstructure, a peak in microhardness in the heat-affected zone, similar ultimate tensile strength but low elongation at break for tensile tests, and reduced absorbed energy for Charpy impact tests. The decrease of the opening angle decreases the relative density and tensile properties but increases the energy absorption of the repaired parts.
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